Main entry: rascally, blackguardly, scoundrelly, roguish
Definition: lacking principles or scruples
Usage: the rascally rabble; the tyranny of a scoundrelly aristocracy - W.M. Thackaray; the captain was set adrift by his roguish crew
Main entry: roguish, rascally, devilish
Definition: playful in an appealingly bold way
Usage: a roguish grin